Means for attaching motion-picture films to winding cores



1,6233116 M lo' 1927 A. N. MERLE MEANS FOR ATTACHING MOTION PICTURE FILMS T0 WINDING CORES Filed Feb 14. 1925 @majo n U U U60- u U n? Patented May 10, 1927.

YANDR Noni.

'ETABLISSEMENTS PATH FRERES, or Panis, FRANCE. f

MEANS FOR ATTACI-IING- MOTION-PICTURE FILMS '550 *'WINDING CORES.

Applicatonvled February 14, 1925, Serial No. 9,364, and in France october 25, 1924.

It has been already proposed, for attaching a motion picture film to a winding core, the height whereof is equal to the width of the film, to wind the end of the film upon Vthe core and to Vclamp this end of the film upon the core by means of a small curved spring which covers somewhat more than half the circumference of the said core. But this method of attaching the film is subject to inconvenience, since the longitudinal axis ofthe film is not always exactly disposed in the meany transverse plane of the core, so that the film will not always be accurately wound in the said plane of the core.

The present invention relates to an improved method for attaching a motion picture film to a winding'core which consists in making the end of the film which is adapted to be attached to said core, narrower than the main part of the film, said end of the film being engagedand clamped in a groove of corresponding width which is formed upon the periphery of the core, whereby the correct winding of the film upon the said core will be ensured.

Due to this arrangement, the narrow end of the film, Vwhich is wound in the groove kprovided on the periphery of the core, is maintained upon said core, so that the longitudinal axis of the film will be situated exactly in the middle plane of the core.

The appended drawing, given by way of example, shows an embodiment of the said invention.

Fig. 1 shows a film whose end portion has a reduced width.

Fig. 2 shows the method of winding and lof attaching the end of the said film upon the core.

Fig. 3 is a cross section of a core according to the invention, two turns of the film being wound thereon.r Y

According to the invention, the film 'l has at its end 2 a width which is less than the widthin the main part of the film carrying the images. Fig. 2 shows the said film with its end wound upon thecore; this latter comprises a middle part 3 and two flanges 4 and 5 of larger diameter than the said middle part. In other terms the part 23 is a groove formed in the periphery of the core.

The height of the part 3 is equalv to the width a of the end of the film, whilst the total height of the core is equal to the width i MERLE, oF PARIS, FnANonjAssIGNoR To PATH .CINMA ANCIENS i the film is wound upon the core, theend portion of the film 2 will come into con tact with the body 3 of the core whilst the first turn 7 of the part of the film having the normal width willenter into contact at its edges with the flanges 4 and 5 of the core.

The result which is attained according to the invention consists in the fact that the film is automatically placed in the proper manner upon the said core, thus affording a decided advantage, and chiefiy when it is considered that the film is usually attached to the core in the dark room.

In the drawings the invention is shown as applied to the case in which the film Vcomprises a single central row of perforations, but it is obvious that this form of construction is given solely by way of example. The film may be perforated in any suitable manner and the perforations may for example be disposed in two rows along the edges of the film; in this event when the end portion of the film is narrowed, a certain number of the perforations will be cut down or even eliminated but this will offer no inconvenience, since these perforations are not employed for the travel of the film and are only formed in this part by reason of the continuous manufacture of the film.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

l. The method of attaching a motion picture film to a winding core which consists in making the end of the film which is adapted to be attached to said core narrower than the main part of the film, pro\fiding upon the eriphery of the core a groove of the same width as said narrowed end of' the film and winding saidnarrowed end of the film about said groove on the core.

2. Means for winding the film on a core of u motion picture apparatus comprising a` core, a film having mbetmltiully a Width equal to the length of the r'ore. one em] of ,mid film adapted to be zrttzuhed to Suid corev being narrower than Jthe 11min part of the ilm,:\ groove provided upon the periphery of said core and adapted to receive said narrowed end of the, {lm and :111 arenal spring blade adapted fo 012111111) said narrowed euri of the Um in said groove. 10

In testimony whereof I have signed my nume ro this speeieation.

ANDR Nom MERLE. 

